How to randomly select n number of pixels from an image whose value is one ?

How to randomly select n number of pixels from an image whose value is one ?

Answer 1

[Thorsten]

 ind = find(I == 1);
 r = randperm(numel(ind));
 r = r(1:n);

[Anushka]

Thank you sir.After selecting this pixels How to change the values of this pixels in the image to zero.